Bug 495852

Summary:	The window flicks when maximizing with blur enabled
Product:	[Plasma] kwin	Reporter:	Lucolesco <lucas564lith>
Component:	effects-various	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED FIXED
Severity:	minor	CC:	kde, xaver.hugl
Priority:	NOR
Version First Reported In:	6.2.2
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Lucolesco 2024-11-05 18:58:49 UTC

SUMMARY
When trying to maximize the window, the blur is disabled and then it gets back to normal after a second.

STEPS TO REPRODUCE
1. Go to appearance's tab in the profile's settings
2. Edit the current color scheme
3. Set the background transparency to any value
4. Enable blur
3. Try maximizing or "de-maximizing" the window 

OBSERVED RESULT
The background flicks for one second when maximizing and "de-maximizing", blur is disabled and you can see through it. 

EXPECTED RESULT
Blur should remain enabled at all times when trying to manipulate the window's dimensions

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.2.2
KDE Frameworks Version: 6.7.0
Qt Version: 6.8.0
Kernel Version: 6.11.6-1-cachyos-bore-lto (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 5600 6-Core Processor
Memory: 15.5 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 2060/PCIe/SSE2

ADDITIONAL INFORMATION
The NVIDIA's driver is the proprietary one. The GSP Firmware is disabled.

Comment 1 David Redondo 2024-11-06 09:03:17 UTC

I can not reproduce 100% but sometimes. In addition when resizing the window it is transparent.

Comment 2 David Redondo 2024-11-06 09:06:17 UTC

Do you have wobbly windows enabled?

Comment 3 Lucolesco 2024-11-06 14:53:28 UTC

(In reply to David Redondo from comment #2)
> Do you have wobbly windows enabled?

No modifications were made. Plasma is set with its default configuration.

Comment 4 Lucolesco 2024-11-06 15:09:25 UTC

(In reply to David Redondo from comment #1)
> I can not reproduce 100% but sometimes. In addition when resizing the window
> it is transparent.

I can reproduce that when I have the wobbly windows enabled. It doesn't happen when it is not enabled. 

By the way, the bug is less prominent when resizing through the window decorations. It is very frequent when maximizing by dragging and dropping the window at the top of the screen.

Comment 5 Zamundaaa 2024-11-06 16:56:39 UTC

Can confirm. This happens 100% reliably for me on maximization.

Comment 6 Lucolesco 2025-11-01 19:08:04 UTC

Operating System: KDE Linux 2025-11-01
KDE Plasma Version: 6.5.80
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.0
Kernel Version: 6.17.5-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 5600 6-Core Processor
Memory: 16 GiB of RAM (15.5 GiB usable)
Graphics Processor: NVIDIA GeForce RTX 2060

The bug does not occur anymore. It's fixed for me.